Optimizing the WEEE Recovery Network Associated with Environmental Protection Awareness and Government Subsidy by Nonlinear Mixed Integer Programming

Table 1

Relationship of variables given by constraints.

	(15)	(16)	(17)	(18)	(19)	(20)	(21)/(33)	(22)	(23)	(24)	(25)	(32)
				✓	✓
			✓	✓
				✓
				✓
				✓
			✓
			✓			✓

represents that the constraints give the relationship among these variables;
✓ represents that the constraints give the bounds of these variables.